US8569244B2 - FOXM1 peptide and medicinal agent comprising the same - Google Patents

FOXM1 peptide and medicinal agent comprising the same Download PDF

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US8569244B2
US8569244B2 US12/673,432 US67343208A US8569244B2 US 8569244 B2 US8569244 B2 US 8569244B2 US 67343208 A US67343208 A US 67343208A US 8569244 B2 US8569244 B2 US 8569244B2
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Yasuharu Nishimura
Kazunori Yokomine
Takuya Tsunoda
Yusuke Nakamura
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Oncotherapy Science Inc
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Definitions

  • the present invention relates to novel peptides that are useful as vaccines against cancers highly expressing forkhead box M1 (FOXM1), such as biliary tract cancer, lung cancer, and pancreatic cancer, and to pharmaceuticals including the peptides for treatment and prevention of tumors.
  • FOXM1 forkhead box M1
  • biliary tract cancer gallbladder cancer and cholangiocarcinoma
  • no subjective symptoms are present in the early stages.
  • cancers that form on the inside of the digestive tract, such as stomach cancer and colon cancer accurate visualization and diagnostic imaging of biliary tract cancer is difficult. Therefore, early detection of biliary tract cancer is difficult, and the cancer has often already progressed and is unresectable when it is found.
  • radiation therapy and chemotherapy are performed for treatment of biliary tract cancer, but they are not therapeutically effective, and thus the establishment of new therapeutic methods is urgently needed.
  • Lung cancer deaths are also on the rise in Japan, and 62,063 people died of the cancer in 2005.
  • lung cancer accounts for 19.0% of the cancer deaths in Japan, and it has been the leading cause of cancer death since 2000.
  • Smoking is said to be the main cause of the onset of lung cancer.
  • inhalation of asbestos or radon gas is also believed to cause lung cancer.
  • Smoking cessation is encouraged and health checks are carried out as measures to prevent lung cancer.
  • the smoking population in Japan in 2005 is still estimated to be approximately 30 million.
  • simple chest X-ray imaging and sputum test widely performed during health checks are not effective for early detection of lung cancer, and thus they do not lead to reduction of cancer deaths. Considering the above, the number of lung cancer deaths is predicted to continue increasing in the future.
  • the symptoms of lung cancer include cough, bloody sputum, shortness of breath, and chest pain, but in most cases, symptoms are absent in the early stages. When symptoms appear, the cancer has already progressed in many cases. Therefore, more than half of the patients are inoperable when the cancer is first discovered, and it is regarded as one of the intractable cancers.
  • the recovery rate after operation is not as good as other cancers, and the overall five-year survival rate after surgery is just short of 50%.
  • the five-year survival rate for early-stage lung cancer is increasing as a result of advances in multimodal treatment by radiotherapy, chemotherapy, and such with surgical resection as the main treatment; however, improvement of the therapeutic effects for advanced lung cancer is poor, and the establishment of new therapeutic strategies is in urgent need.
  • pancreatic cancer deaths are also on the increase in Japan, and 22,927 people died of the cancer in 2005.
  • pancreatic cancer accounts for 7.0% of the cancer deaths in Japan, and ranks fifth following lung cancer, stomach cancer, colon cancer, and liver cancer.
  • Even today with advances in diagnostic imaging approximately 40% of total Japanese pancreatic cancer patients belong to advanced cases with distant metastasis, and many patients are found to have unresectable locally-advanced cancer. Therefore, the overall five-year survival rate of the patients is 5% or less, and the prognosis after diagnosis is very poor.
  • pancreatic cancer Due to the difficulty in diagnosis, the incidence of pancreatic cancer as a cause of cancer death is gradually increasing particularly in advanced countries.
  • multimodal treatment by radiotherapy, chemotherapy, and such with surgical resection as the central treatment is presently carried out, there is no dramatic improvement in the therapeutic effects, and the establishment of novel therapeutic strategies is urgently needed.
  • lifestyle habits including smoking, obesity, diet, alcohol drinking, and coffee drinking, as well as chronic pancreatitis, diabetes, genetic factors, and such have been suggested to be involved in causing the onset of pancreatic cancer.
  • cytotoxic (killer) T cells and helper T cells recognize peptides generated by degradation of proteins that are specifically and highly expressed in cancer cells and which are presented on the surface of cancer cells or antigen presenting cells via HLA molecules, and cause immunoreaction to destroy cancer cells.
  • tumor antigen proteins and peptides derived therefrom, which stimulate such immunoreaction to attack cancer have been identified, and antigen-specific tumor immunotherapy is being clinically applied.
  • the HLA class I molecule is expressed on the surface of all nucleated cells of the body. It binds to a peptide generated by intracellular degradation of proteins produced in the cytoplasm or nucleus, and expresses the peptide on the cell surface. On the surface of a normal cell, peptides derived from normal autologous proteins bind to HLA class I molecules, and are not recognized and destroyed by T cells of the immune system. On the other hand, in the process of becoming a cancer, cancer cells sometimes express a large quantity of proteins that are hardly or slightly expressed in normal cells.
  • HLA class I molecules When HLA class I molecules bind to peptides generated by intracellular degradation of proteins specifically and highly expressed in cancer cells, and then express the peptides on the surface of cancer cells, killer T cells recognize and destroy only the cancer cells. By administering such cancer-specific antigens or peptides to an individual, cancer cells can be destroyed and cancer growth can be suppressed without harming normal cells. This is called cancer immunotherapy using cancer-specific antigens.
  • HLA class II molecules are mainly expressed on the surface of antigen-presenting cells. The molecules bind to peptides derived from cancer-specific antigens, which are generated by intracellular degradation of cancer-specific antigens incorporated into antigen-presenting cells from outside of the cells, and then express the peptides on the surface of the cells. Helper T cells that recognize them are activated, and induce or enhance immunoreaction against tumors by producing various cytokines that activate other immunocompetent cells.
  • an immunotherapy that targets antigens specifically and highly expressed in cancers can effectively eliminate cancers alone without causing any harmful event on normal autologous organs. It is also expected that the therapy can be used for any terminal cancer patients to whom other treatments cannot be applied.
  • a cancer-specific antigen and peptide as a vaccine in advance to individuals with a high risk of developing cancers, cancer development can be prevented.
  • the present inventors first conducted genome-wide gene expression analysis on 27,648 human genes using cDNA microarrays to investigate the expression profiles of these genes in 25 intrahepatic bile duct cancer cases and in various normal organs including those in the embryonic stage.
  • Forkhead box m1 (FOXM1) (GenBank Accession No. NM — 202003) was very highly expressed in the tissues of many intrahepatic bile duct cancer cases. Similar to and in addition to intrahepatic bile duct cancer, FOXM1 was found to be highly expressed in almost all the cases of lung cancer, bladder cancer, and pancreatic cancer.
  • FOXM1 farnesoid leukemia
  • ovarian cancer malignant lymphoma
  • breast cancer stomach cancer
  • esophageal cancer prostate cancer
  • hepatocellular carcinoma colon cancer
  • chronic myeloid leukemia a cancer-specific antigen in various cancers.
  • FOXM1 is expressed in embryonic liver, and in normal adult organs, it is slightly expressed in the digestive tract such as stomach, small intestine, and large intestine, thymus, and testis; however, the expression level is remarkably low compared to cancerous parts.
  • none of the documents describes the use of FOXM1 as a vaccine against cancer.
  • An objective of the present invention is to develop a means for carrying out immunotherapy that suppresses cancer growth by enhancing the anti-cancer immunity of cancer patients as a novel therapeutic method for metastatic or intractable cancers that are difficult to be treated by surgical therapy, chemotherapy, and radiotherapy which are conducted as therapeutic methods for biliary tract cancer, lung cancer, pancreatic cancer, and such. More specifically, an objective of the present invention is to identify peptides that are derived from proteins highly and specifically expressed in cancers and can induce strong immunoreaction against the above-mentioned cancers without causing adverse events in cancer patients, and to apply these peptides in tumor immunotherapy.
  • the present invention enables immunotherapy for approximately 30% of the Japanese patients with the above-mentioned cancers, by identifying peptides that are derived from a protein highly and specifically expressed in the above-mentioned cancers and are presented to killer T cells by HLA-A2.
  • the present inventors induced FOXM1 peptide-specific killer T cells by in vitro stimulation of human CD8 positive killer T cells by co-culturing them with human peripheral blood monocyte-derived dendritic cells pulsed with human FOXM1 peptides which have an HLA-A2 binding motif. Whether or not there was induction of killer T cells specific to each FOXM1 peptide was examined by detecting ⁇ -interferon (IFN- ⁇ ) produced by the killer T cells activated from recognition of the peptide presented by HLA-A2 using ELISPOT assay. As a result, novel FOXM1 peptides that are potentially candidate target antigens applicable to immunotherapy were identified.
  • IFN- ⁇ ⁇ -interferon
  • FOXM1-responsive CTLs induced using the aforementioned peptides have specific cytotoxicity against cancer cells expressing endogenous FOXM1 and HLA-A2 molecules, and that the CTLs recognize target cells in an HLA class I-restricted manner.
  • the present invention provides the following:
  • an agent for inducing immunity against cancer which includes one or more peptide(s) of [1] as an active ingredient;
  • an agent for treating and/or preventing cancer which includes one or more peptide(s) of [1] as an active ingredient;
  • an agent for inducing an antigen presenting cell that shows cytotoxic (killer) T cell-inducing activity wherein said agent includes one or more peptide(s) of [1] as an active ingredient;
  • an agent for inducing an antigen-presenting cell that shows cytotoxic (killer) T cell-inducing activity wherein said agent includes one or more polynucleotide(s) encoding the peptide of [1] as an active ingredient;
  • an agent for inducing a cytotoxic (killer) T cell wherein said agent includes one or more peptide(s) of [1] as an active ingredient;
  • a cytotoxic (killer) T cell a helper T cell, or an immunocyte population including them, which is induced using the peptide of [1];
  • [15] a method for inducing an antigen-presenting cell that shows cytotoxic (killer) T cell-inducing activity, which includes the step of contacting an antigen-presenting cell with the peptide of [1];
  • [16] a method for inducing an antigen-presenting cell that shows cytotoxic (killer) T cell-inducing activity, which includes the step of introducing a polynucleotide encoding the peptide of [1] into an antigen presenting cell;
  • [17] a method for inducing a cytotoxic (killer) T cell, which includes the step of contacting a T cell with the peptide of [1];
  • the present invention also provides the following:
  • [18] a method for inducing immunity against cancer, which includes the step of administering the peptide of [1] to a subject;
  • [19] a method for treating and/or preventing cancer, which includes the step of administering the peptide of [1] to a subject;
  • FIG. 1 shows the results of ELISPOT assay and cytotoxicity test.
  • CD8 positive T cells were isolated from the peripheral blood of HLA-A2 positive healthy individuals and breast cancer patients.
  • Killer T cells obtained by stimulation with monocyte-derived dendritic cells pulsed with each FOXM1 peptide were examined by ELISPOT assay to determine whether they react specifically to the FOXM1 peptides and produce IFN- ⁇ .
  • ELISPOT assay to determine whether they react specifically to the FOXM1 peptides and produce IFN- ⁇ .
  • T2-A2 cells were used as the target cells in the ELISPOT assay.
  • T2-A2 cells are a cell line produced by introducing the HLA-A2 gene into a mouse T2 cell line deficient in TAP gene expression. Due to TAP deficiency in T2-A2 cells, a complex formed with the HLA-A2 molecule and an exogenously-added peptide is expressed on the cell surface only when the peptide has the capacity of binding to the HLA-A2 molecule.
  • Panc-1 cells that are HLA-A2 positive and express FOXM1
  • PK-8 cells that are HLA-A2 negative and FOXM1 positive, were used to evaluate the cytotoxic activity.
  • killer T cells induced from two healthy individuals using the FOXM1 362-370, 373-382, and 640-649 peptides produced IFN- ⁇ by recognizing the FOXM1 362-370, 373-382, and 640-649 peptides bound to HLA-A2 and expressed on T2-A2 cells.
  • killer T cells from breast cancer patients that were induced using the above-mentioned peptides showed strong cytotoxic activity against panc-1 cells, but did not show cytotoxic activity against PK-8 cells.
  • the induced killer T cells were found to show strong cytotoxic activity against cancer cell lines by specifically recognizing FOXM1 in an HLA-A2 restricted manner.
  • FOXM1 362-370, 373-382, and 640-649 peptides can induce FOXM1-specific human killer T cells in an HLA-A2 restricted manner, and such killer T cells can damage FOXM1-expressing cancer cells.
  • the peptides of the present invention are epitopes restricted to HLA-A2 which is an HLA allele frequently found in the Japanese and Caucasian populations. Using the binding affinity to HLA-A2 as an index, candidate HLA-A2 binding peptides derived from FOXM1 were selected.
  • Killer T cells from breast cancer patients that were induced using the above-mentioned peptides showed strong cytotoxic activity against panc-1 cells, but did not show cytotoxic activity against PK-8 cells.
  • the induced killer T cells were demonstrated to specifically recognize FOXM1 in an HLA-A restricted manner and show strong cytotoxic activity against cancer cell lines. Accordingly, it was revealed that the peptide of any one of FOXM1-362-370 (YLVPIQFPV (SEQ ID NO: 1)), FOXM1-373-382 (SLVLQPSVKV (SEQ ID NO: 2)), and FOXM1-640-649 (GLMDLSTTPL (SEQ ID NO: 3)) can induce FOXM1-specific human killer T cells in an HLA-A2 restricted manner, and such killer T cells can damage FOXM1-expressing cancer cells.
  • FOXM1-362-370 YLVPIQFPV (SEQ ID NO: 1)
  • FOXM1-373-382 SLVLQPSVKV (SEQ ID NO: 2)
  • FOXM1-640-649 GLMDLSTTPL (SEQ ID NO: 3)
  • FOXM1 was found to be highly expressed in almost all cases of lung cancer, bladder cancer, and pancreatic cancer, similarly to and in addition to intrahepatic bile duct cancer. Furthermore, FOXM1 was highly expressed in 40% or more of the cases in a wide variety of cancers such as cervical cancer, ovarian cancer, malignant lymphoma, breast cancer, stomach cancer, esophageal cancer, prostate cancer, hepatocellular carcinoma, colon cancer, and chronic myeloid leukemia. These facts show that FOXM1 is useful as a target for immunotherapy of various cancers.
  • a peptide of the present invention is any one of (A) to (D) below:
  • a peptide that shows cytotoxic (killer) T cell-inducing activity means “a peptide having T cell-inducing activity that stimulates killer T cells (cytotoxic T cells/CTLs)”.
  • the peptide of the present invention is a peptide (epitope peptide) having less than 40 amino acids, preferably less than 20 amino acids, more preferably less than about 15 amino acids, and including the amino acid sequence of any one of SEQ ID NOs: 1 to 3, and showing an activity of inducing killer T cells.
  • the peptides of the present invention may include a peptide including the amino acid sequence of any one of SEQ ID NOs: 1 to 3, wherein one, two, or several amino acids are substituted, deleted, inserted, and/or added, as long as the ability to induce killer T cells is retained.
  • the number of residues substituted, deleted, inserted, and/or added is generally five amino acids or less, preferably four amino acids or less, more preferably three amino acids or less, even more preferably one amino acid or two amino acids.
  • Variant peptides i.e., peptides including amino acid sequences obtained by modifying the original amino acid sequences by substitution, deletion, insertion, and/or addition of one, two, or several amino acid residues
  • the amino acid modification preferably retains the properties of the original amino acid side chains.
  • hydrophobic amino acid side chains A, I, L, M, F, P, W, Y, V
  • hydrophilic amino acid side chains R, D, N, C, E, Q, G, H, K, S, T
  • side chains having the following functional groups or characteristics in common aliphatic side chains (G, A, V, L, I, P); hydroxy group-containing side chains (S, T, Y); sulfur atom-containing side chains (C, M); carboxylic acid- and amide-containing side chains (D, N, E, Q); base-containing side chains (R, K, H); and aromatic ring-containing side chains (H, F, Y, W).
  • the characters in the parentheses show one letter codes of amino acids.
  • the peptides of the present invention are nonapeptides (9-mer) or decapeptides (10-mer).
  • the amino acid sequence of a partial peptide of naturally-occurring FOXM1 may be modified by substitution, deletion, insertion, and/or addition of one, two, or several amino acids.
  • the term “several” refers to five or less, preferably three or less, more preferably two or less.
  • the peptides of the present invention can be modified based on the regularity in order to enhance their affinity to HLA antigens.
  • epipe peptides can be modified based on the regularity in order to enhance their affinity to HLA antigens.
  • peptides with high HLA-A2 binding affinity can be obtained by substituting the second amino acid from the N terminus with leucine or methionine.
  • peptides with high HLA-A2 binding affinity can also be obtained by substituting the C-terminal amino acid with valine or leucine.
  • an epitope peptide When the sequence of an epitope peptide is identical to a portion of the amino acid sequence of an endogenous or exogenous protein having a different function, side effects such as autoimmune disorders or allergy symptoms against a specific substance can be caused.
  • a modified epitope peptide should not be identical to the amino acid sequences of known proteins.
  • risks caused by the above-mentioned amino acid sequence modification for increasing the binding affinity to HLA antigens and/or for increasing the killer T cell-inducing activity can be avoided.
  • candidate peptides selected using high binding affinity as an index need to be examined whether they actually have killer T cell-inducing activity.
  • the killer T cell-inducing activity can be confirmed by: inducing antigen-presenting cells having the human MHC antigen (for example, B lymphocytes, macrophages, and dendritic cells), and more specifically, inducing dendritic cells derived from human peripheral blood mononuclear leukocytes; stimulating them with a peptide of interest; then mixing them with CD8 positive cells; and measuring the cytotoxic activity towards target cells.
  • human MHC antigen for example, B lymphocytes, macrophages, and dendritic cells
  • transgenic animals that express the human HLA antigen (as described in, for example, BenMohamed L, et al. (2000) Hum. Immunol. 61(8):764-79, Related Articles, Books, and Linkout) can be used.
  • target cells can be radiolabeled with 51 Cr or such, and the cytotoxic activity can be calculated from the radioactivity released from the target cells.
  • the target cells can be examined by: measuring IFN- ⁇ produced and released by killer T cells in the presence of the antigen-presenting cells having an immobilized peptide; and visualizing the IFN- ⁇ production zone in the culture medium using an anti-IFN- ⁇ monoclonal antibody.
  • the result of examining the killer T cell-inducing activity of peptides showed that peptides having high binding affinity to the HLA antigen do not necessarily have high inducing activity.
  • the nonapeptides containing the amino acid sequence of any one of FOXM1-362-370 (YLVPIQFPV (SEQ ID NO: 1)), FOXM1-373-382 (SLVLQPSVKV (SEQ ID NO: 2)), and FOXM1 640-649 (GLMDLSTTPL (SEQ ID NO: 3) showed particularly high killer T cell-inducing activity.
  • the present invention provides peptides showing killer T cell-inducing activity, more specifically, peptides including the amino acid sequence of any one of SEQ ID NOs: 1 to 3, and variants thereof (i.e., amino acid sequences in which one, two, or several amino acids are substituted, deleted, inserted and/or added).
  • the amino acid sequences of the peptides including the nine amino acids of any one of SEQ ID NOs: 1 to 3, or variants thereof are not identical to those of other endogenous proteins.
  • peptides with high HLA-A2 binding affinity can be obtained by substituting the second amino acid from the N terminus with leucine or methionine, and/or by substituting the C-terminal amino acid with valine or leucine.
  • the peptides of the present invention may include modifications such as glycosylation, side chain oxidization, and phosphorylation, unless the peptides lose their killer T cell-inducing activity.
  • modifications include, for example, D-amino acids and other amino acid analogues that can be used to increase the serum half-life of the peptides.
  • Methods for obtaining and producing the peptides of the present invention are not particularly limited. They may be chemically synthesized peptides or recombinant peptides produced by gene recombination techniques.
  • Chemically synthesized peptides of the present invention can be synthesized according to chemical synthesis methods such as the Fmoc method (fluorenylmethyloxycarbonyl method) and the t-Boc method (t-butyloxycarbonyl method).
  • the peptides of the present invention can also be synthesized utilizing various commercially-available peptide synthesizers.
  • the peptides of the present invention can be produced as recombinant proteins by obtaining DNAs having the nucleotide sequences encoding the peptides, or variants or homologs thereof, and introducing them into a suitable expression system.
  • Expression vectors used may be preferably any vectors that can be autonomously duplicated in host cells, or can be incorporated into the chromosome of host cells, and contain a promoter at a suitable position to allow expression of a peptide-encoding gene.
  • Transformants having a gene encoding the peptide of the present invention can be produced by introducing the above-mentioned expression vector into a host.
  • the host may be any of bacteria, yeast, animal cells, and insect cells, and the expression vector may be introduced into the host using known techniques depending on the host.
  • the recombinant peptides can be isolated by culturing a transformant prepared as described above, producing and accumulating the peptides in the culture, and collecting the peptides of the present invention from the culture.
  • the culture medium for these microorganisms may be either natural or synthetic medium, as long as it contains carbon source, nitrogen source, minerals, and such that can be utilized by the microorganisms, and allows efficient culture of the transformant.
  • the culture conditions may be those conventionally used for culturing the microorganisms.
  • the peptides of the present invention can be isolated and purified from the culture of the transformant using conventional methods for peptide isolation and purification.
  • Peptides including an amino acid sequence in which one, two, or several amino acids are substituted, deleted, inserted, or added in the amino acid sequence of any one of SEQ ID NOs: 1 to 3 can be appropriately produced or obtained by a person skilled in the art based on the information on the DNA nucleotide sequence encoding the amino acid sequence of any one of SEQ ID NOs: 1 to 3.
  • a gene that encodes a peptide including an amino acid sequence in which one, two, or several amino acids are substituted, deleted, inserted and/or added in the amino acid sequence of any one of SEQ ID NOs: 1 to 3, and showing killer T cell-inducing activity can be produced by any methods known to persons skilled in the art, such as chemical synthesis, genetic engineering techniques, and mutagenesis.
  • the site-directed mutagenesis method which is one of the genetic engineering techniques, is useful since it can introduce a specific mutation into a specific position.
  • the present invention provides agents for inducing immunity against cancer including one or more of the peptides of the present invention as an active ingredient.
  • the immunity-inducing agents of the present invention can be prepared as a mixed formulation combining two or more epitope peptides. Immunity-inducing agents formulated by combining multiple types of peptides may be a cocktail, or may be mutually bound using standard techniques.
  • the epitope peptides to be combined may be peptides having different amino acid sequences derived from the same gene, or may be peptides having amino acid sequences derived from different genes.
  • antigen-presenting cells that present the peptides of the present invention on their cell surface can be obtained.
  • killer T cells can be induced in the subject's body, and as a result, immune response to target cells presenting the peptides of the present invention can be enhanced.
  • the agents for inducing immunity against cancer of the present invention can induce helper T cells, killer T cells, or immunocyte populations including these cells, thereby providing immunity against cancer.
  • the peptides of the present invention can induce cancer cell-specific killer T cells in vivo.
  • FOXM1 was highly expressed in most cases of lung cancer, cholangiocellular carcinoma, bladder cancer, renal cell carcinoma, prostate cancer, chronic myelogenous leukemia, malignant lymphoma, cervical cancer, osteosarcoma, breast cancer, soft tissue sarcoma, colon cancer, and such.
  • the immunity-inducing agents including one or more of the peptides of the present invention as an active ingredient are expected to be effective as agents for treatment and/or prevention of cancer.
  • induction and activation of tumor-attacking killer T cells can be expected by injecting the peptides of the present invention together with a suitable adjuvant into the body, or by pulsing antigen-presenting cells such as dendritic cells with the peptides, and then injecting them into the body.
  • anticancer effects can be expected.
  • a gene encoding a peptide of the present invention can be incorporated into a suitable vector.
  • Human antigen-presenting cells dendritic cells, etc.
  • bacteria such as BCG Mycobacterium tuberculosis that are transformed with the recombinant DNA, or viruses such as vaccinia viruses that have a DNA encoding the peptide of the present invention incorporated into their genome, can be used effectively as live vaccines for treatment and/or prevention of human cancer.
  • the dosages and the administration methods for the cancer vaccines are the same as those for conventional smallpox vaccines and BCG vaccines.
  • the term “vaccine” refers to a substance that induces antitumor immunity or suppresses various cancers when inoculated to an animal.
  • the peptide including the amino acid sequence of any one of SEQ ID NOs: 1 to 3 is an HLA-A2 restricted epitope peptide that can induce strong and specific immune response against FOXM1-presenting cells.
  • the present invention also includes methods for inducing antitumor immunity by using the peptides including the amino acid sequence of any one of SEQ ID NOs: 1 to 3, or variants thereof that include substitution, deletion, insertion and/or addition of one, two, or several amino acids.
  • the antitumor immunity includes the following immune responses:
  • the peptide When a particular peptide induces any one of these immune responses through inoculation to an animal, the peptide is determined to have antitumor immunity-inducing effect. Induction of antitumor immunity by the peptide can be detected by observing in vivo or in vitro response of the immune system in a host to the peptide.
  • T cells that respond to antigens presented by antigen-presenting cells in an antigen-specific manner differentiate into killer T cells (also called cytotoxic T cells or CTLs) through stimulation by antigens, and then proliferate.
  • killer T cells also called cytotoxic T cells or CTLs
  • activation of T cells.
  • Induction of killer T cells by a specific peptide can be evaluated by presenting the peptide to T cells using peptide-pulsed antigen-presenting cells, and then detecting the induction of killer T cells.
  • antigen-presenting cells have an effect of activating CD4 + T cells, CD8 + T cells, macrophages, eosinophils, and NK cells. Since CD4 + T cells are important in antitumor immunity, the antitumor immunity-inducing action of the peptide can be evaluated using the effect on activating these cells as an index.
  • a method for evaluating the effect of inducing killer T cells that are induced using dendritic cells (DCs) as antigen-presenting cells is well known in the art.
  • DCs dendritic cells
  • antigen-presenting cells DCs have the strongest killer T cell-inducing effect.
  • a test peptide is contacted with DCs, and then the DCs are contacted with T cells.
  • T cells that have cytotoxic effect on target cells are detected from the T cells contacted with DCs. If the T cells show cytotoxic activity against the target cells, it means that the test peptide has the activity to induce cytotoxic T cells.
  • the activity of killer T cells against target cells such as tumors can be detected, for example, using lysis of 51 Cr-labeled tumor cells as an index.
  • the degree of tumor cell damage can be evaluated using 3 H-thymidine uptake activity or LDH (lactose dehydrogenase) release as an index.
  • Test peptides confirmed by these methods to show killer T cell-inducing activity are peptides that show DC-activating effect and subsequent killer T cell-inducing activity. Therefore, the peptides that show an activity of inducing killer T cells against tumor cells are useful as vaccines against cancers presenting FOXM1. Furthermore, antigen-presenting cells that have acquired the ability (activity) to induce killer T cells against cancers through contact with the peptides are useful as vaccines against cancers. Furthermore, killer T cells that have acquired cytotoxicity as a result of presentation of the peptides by antigen-presenting cells can also be used as vaccines against cancers presenting FOXM1. Methods of cancer treatment using antitumor immunity by antigen-presenting cells and killer T cells are called cytoimmunotherapy.
  • the efficiency of inducing killer T cells can be enhanced by combining multiple peptides having different structures. Therefore, when stimulating DCs with protein fragments, it is advantageous to use a mixture of multiple types of peptide fragments.
  • Induction of antitumor immunity by peptides can also be evaluated by observing the induction of antibody production against tumors. For example, when antibodies are induced against peptides by immunizing laboratory animals with the peptides, and they suppress growth, proliferation, and/or metastasis of tumor cells, it is determined that the peptides induce antitumor immunity.
  • Antitumor immunity can be induced by administering a vaccine of the present invention, and the induction of antitumor immunity enables treatment and/or prevention of cancers.
  • Effects of cancer treatment and/or prevention of cancer development may include inhibition of cancer cell growth, regression of cancer cells, and suppression of cancer cell development. Decrease in the mortality rate of individuals with cancer, decrease in tumor markers in blood, and reduction of detectable symptoms associated with cancer are also included in the effects of treatment and/or prevention of cancer.
  • the therapeutic and/or preventive effects of a vaccine against cancer are preferably statistically significant compared to those of a control without vaccine administration. For example, the effects are preferably observed at a significance level of 5% or less.
  • Statistical methods such as Student t-test, Mann-Whitney U test, ANOVA, or such may be used for determining the statistical significance.
  • the subject is preferably a mammal.
  • mammals include humans, non-human primates, mice, rats, dogs, cats, horses, and cattle, but are not limited hereto.
  • the peptides of the present invention can be administered to a subject in vivo or ex vivo. Furthermore, to produce an immunogenic composition for treatment and/or prevention of cancer, the immunogenic peptides of the present invention, that is, nonapeptides selected from the amino acid sequences of SEQ ID NOs: 1 to 3, and mutant peptides thereof, may be used.
  • the present invention provides pharmaceutical agents for treatment of tumor or prevention of tumor growth, metastasis, and such, which include one or more of the peptides of the present invention as an active ingredient.
  • the peptides of the present invention are particularly useful for treatment of tumors such as pancreatic cancer, cholangiocellular carcinoma, stomach cancer, colon cancer, non-small-cell lung cancer, testicular cancer, cervical cancer, osteosarcoma, and soft tissue sarcoma.
  • the peptides of the present invention can be administered directly to a subject as pharmaceutical agents formulated by conventional formulation methods.
  • Such formulations may contain, in addition to the peptides of the present invention, pharmaceutically acceptable carriers, excipients, and such, as necessary.
  • the pharmaceutical agents of the present invention may be used for treatment and/or prevention of various tumors.
  • adjuvants can be mixed into pharmaceutical agents for treatment and/or prevention of tumors including one or more of the peptides of the present invention as an active ingredient.
  • the agents may be co-administered with other active ingredients such as antitumor agents.
  • Appropriate formulations also include granules. Appropriate adjuvants are described in the literature (Johnson A G (1994) Clin. Microbiol. Rev., 7:277-89).
  • adjuvants examples include Freund's incomplete adjuvant, BCG, trehalose dimycolate (TDM), lipopolysaccharide (LPS), aluminum potassium sulfate adjuvant, silica adjuvant, aluminum phosphate, aluminum hydroxide, and alum, but are not limited thereto.
  • liposomal formulations, granular formulations in which a drug is bound to beads having a diameter of several micrometers, and formulations in which lipids are bonded to the aforementioned peptides may be conveniently used.
  • Administration methods may be oral administration, intradermal injection, subcutaneous injection, intravenous injection, or such, and may include systemic administration and local administration near the target tumor.
  • the dose of the peptides of the present invention can be adjusted appropriately depending on the disease to be treated, age and body weight of the patient, administration method, and such.
  • the dose is usually 0.001 mg to 1000 mg, preferably 0.01 mg to 100 mg, and more preferably 0.1 mg to 10 mg.
  • administration is performed once a few days to a few months, but those skilled in the art can easily select the appropriate dose and administration method; and selection and optimization of these parameters are fully within the scope of conventional techniques.
  • the form of formulations is not particularly limited, and they may be freeze-dried, or granulated by adding excipients such as sugar.
  • Auxiliary agents that can be added to the pharmaceutical agents of the present invention for increasing the killer T cell-inducing activity include bacterial components of BCG bacteria and such including muramyl dipeptide (MDP), ISCOM described in Nature, vol. 344, p 873 (1990), QS-21 of saponin series described in J. Immunol. vol. 148, p 1438 (1992), liposome, and aluminum hydroxide.
  • MDP muramyl dipeptide
  • immunostimulants such as lentinan, sizofiran, and picibanil can also be used as auxiliary agents.
  • Cytokines and such that enhance the growth and differentiation of T cells such as IL-2, IL-4, IL-12, IL-1, IL-6, and TNF, as well as ⁇ -galactosylceramide which activates NKT cells, and CpG and lipopolysaccharides (LPS) which activate the natural immune system by binding to Toll-like receptors, and such, can also be used as auxiliary agents.
  • T cells such as IL-2, IL-4, IL-12, IL-1, IL-6, and TNF
  • ⁇ -galactosylceramide which activates NKT cells
  • CpG and lipopolysaccharides (LPS) which activate the natural immune system by binding to Toll-like receptors, and such, can also be used as auxiliary agents.
  • Vaccine compositions of the present invention contain a component that primes killer T cells.
  • Lipids have been identified as a substance for priming against viral antigens in vivo.
  • palmitic acid residues can be bound to the ⁇ -amino group and ⁇ -amino group of a lysine residue, and then linked to an immunogenic peptide of the present invention.
  • the lipidated peptides can be directly administered by incorporating them into a micelle or particle, or encapsulating them into a liposome, or emulsifying them in an adjuvant.
  • Another example of lipid priming is priming with an E.
  • coli lipoprotein such as tripalmitoyl-S-glycerylcysteinyl-seryl-serine (P3CSS) when covalently bound to a suitable peptide (Deres K., et al., (1989) Nature 342:561-4).
  • P3CSS tripalmitoyl-S-glycerylcysteinyl-seryl-serine
  • the immunogenic peptides of the present invention can be expressed by viral vectors or bacterial vectors.
  • appropriate expression vectors include avirulent viral hosts such as vaccinia and fowlpox.
  • a vaccinia virus can be used as a vector to express a nucleotide sequence encoding the peptide.
  • the immunogenic peptides are expressed, eliciting immune response.
  • the immunization method using vaccinia vectors is described, for example, in U.S. Pat. No. 4,722,848. Bacille Calmette-Guerin (BCG) may also be used.
  • BCG vectors are described in Stover C K, et al., (1991) Nature 31:456-60.
  • a wide variety of other vectors useful for therapeutic administration or immunization including adenovirus vectors and adeno-associated virus vectors, retroviral vectors, typhoid bacillus ( Salmonella typhi ) vectors, and detoxified anthrax toxin vectors, are known in the art. See, for example, Shata M T, et al., (2000) Mol. Med. Today 6:66-71; Shedlock D J and Weiner D B., et al., (2000) J. Leukoc. Biol. 68:793-806; and Hipp J D, et al., (2000) In Vivo 14:571-85.
  • Killer T cells can be effectively induced in the body of a patient by adding an antigenic peptide in vitro to cells collected from the patient or cells from another individual sharing some of the HLA alleles (allogeneic cells), and presenting the antigen, and then administering the cells to the patient intravascularly, locally to the tumor, or such.
  • the cells can be administered to the patient intravascularly, locally to the tumor, or such.
  • Such cell transfer treatment has already been carried out as cancer therapy, and is a well-known method among those skilled in the art.
  • the type of cancers in the present invention is not particularly limited, and specific examples include esophageal cancer, breast cancer, thyroid cancer, colon cancer, pancreatic cancer, malignant melanoma (melanoma), malignant lymphoma, osteosarcoma, pheochromocytoma, head and neck cancer, uterine cancer, ovarian cancer, brain tumor, chronic myelogenous leukemia, acute myelogenous leukemia, renal cancer, prostate cancer, lung cancer, stomach cancer, liver cancer, gallbladder cancer, testicular cancer, thyroid cancer, bladder cancer, sarcoma, etc.
  • Examples of cancers for which application of the present invention is suitable include biliary tract cancer, lung cancer, pancreatic cancer, and bladder cancer.
  • the present invention also relates to antibodies that recognize a portion of or the entire peptide of the present invention mentioned above as an epitope (antigen), and relates to killer T cells that are induced by in vitro stimulation using the proteins or peptides. In general, the killer T cells demonstrate more potent antitumor activity than the antibodies.
  • the antibodies of the present invention are useful as prophylactic and/or therapeutic agents against cancers expressing FOXM1, as long as they can inhibit the activity of the FOXM1 cancer antigen.
  • the peptides or antibodies of the present invention may be administered as they are, or by injection with a pharmaceutically acceptable carrier and/or diluent, together with an adjuvant as necessary.
  • they can be administered by transdermal absorption through mucous membranes by the spray method or such. More specifically, herein, human serum albumin is an example of carriers; and PBS, distilled water, and such are examples of diluents.
  • the antibodies of the present invention may be polyclonal antibodies or monoclonal antibodies, and can be produced by methods known to those skilled in the art.
  • polyclonal antibodies can be obtained by immunizing mammals or avian species with a peptide of the present invention as an antigen, and collecting blood from the mammals or avian species, and separating and purifying antibodies from the collected blood.
  • mammals such as mouse, hamster, guinea pig, chicken, rat, rabbit, dog, goat, sheep, and bovine, or avian species can be immunized.
  • Methods of immunization are known to those skilled in the art, and the antigen can be administered, for example, two or three times at an interval of, for example, 7 to 30 days.
  • the dosage can be, for example, approximately 0.05 mg to 2 mg of antigen per administration.
  • the route of administration is not particularly limited, and can be suitably selected from subcutaneous administration, intradermal administration, intraperitoneal administration, intravenous administration, intramuscular administration, and such.
  • the antigen can be applied after dissolving it in a suitable buffer, for example, a buffer containing a conventional adjuvant such as Freund's complete adjuvant and aluminum hydroxide.
  • the immunized mammals or avian species After the immunized mammals or avian species are reared for a certain period of time, when the antibody titer has increased, they can be additionally immunized with, for example, 100 ⁇ g to 1000 ⁇ g of the antigen.
  • Blood can be collected from the immunized mammals or avian species one to two months after the final administration, and the blood can be separated and purified by conventional methods such as centrifugation, precipitation using ammonium sulfate or polyethylene glycol, chromatography such as gel filtration chromatography, ion exchange chromatography, affinity chromatography, and such, to obtain the polyclonal antibodies that recognize the peptides of the present invention as a polyclonal antiserum.
  • monoclonal antibodies can be obtained by preparing hybridomas.
  • hybridomas can be obtained by cell fusion of antibody-producing cells with myeloma cell lines.
  • Hybridomas that produce monoclonal antibodies of the present invention can be obtained by cell fusion methods such as those indicated below.
  • Spleen cells, lymph node cells, B lymphocytes, and such from immunized animals are used as antibody-producing cells.
  • the peptides of the present invention are used as antigens.
  • Animals such as mouse and rat can be used as immunized animals, and administration of antigens to these animals is carried out by conventional methods.
  • animals are immunized by administering a suspension or emulsion of a peptide of the present invention, which is an antigen, with an adjuvant such as Freund's complete adjuvant and Freund's incomplete adjuvant, to the animals several times intravenously, subcutaneously, intradermally, intraperitoneally, or such.
  • Antibody-producing cells such as spleen cells are obtained from the immunized animals, and can be fused with myeloma cells by known methods (G Kohler et al., Nature, 256, 495 (1975)) to generate hybridomas.
  • myeloma cell lines used for cell fusion include, for example, the P3X63Ag8, P3U1, Sp2/0 lines, etc.
  • a fusion-promoting agent such as polyethylene glycol and Sendai virus is used for cell fusion, and hypoxanthine/aminopterin/thymidine (HAT) medium is used for selecting hybridomas by a conventional method after cell fusion.
  • HAT hypoxanthine/aminopterin/thymidine
  • Hybridomas obtained by cell fusion are cloned by the limiting dilution method or such.
  • cell lines producing monoclonal antibodies that specifically recognize the peptides of the present invention can be obtained by using the peptides of the present invention in screening with an enzyme immunoassay method.
  • immunized cells can be modulated by stimulating human lymphocytes such as EB virus-infected lymphocytes in vitro using the peptides of the present invention, cells expressing the peptides, or lysates thereof.
  • Human antibodies that bind to the peptides of the present invention can be obtained by fusing the immunized lymphocytes with human-derived bone marrow cells such as U266 (Japanese Patent Application Kokai Publication No. (JP-A) S63-17688 (unexamined, published Japanese patent application)).
  • the hybridomas can be cultured by conventional culture methods or ascites-forming methods, and the monoclonal antibodies can be purified from the culture supernatant or ascites. Purification of monoclonal antibodies from culture supernatants or ascites can be performed by conventional methods. For example, ammonium sulfate fractionation, gel filtration, ion exchange chromatography, affinity chromatography, and such can be suitably combined and used.
  • Transgenic animals that have a group of human antibody genes can be immunized using the peptides of the present invention, cells expressing the peptides, or lysates thereof.
  • Antibody-producing cells can be collected from the immunized transgenic animals, and fused with the above-described myeloma cell lines to obtain hybridomas.
  • Monoclonal antibodies of interest can then be produced from the hybridomas (WO92/03918; WO94/02602; WO94/25585; WO94/33735; WO96/34096).
  • antibody-producing immune cells such as immunized lymphocytes can be immortalized using oncogenes, and used for preparation of monoclonal antibodies.
  • Monoclonal antibodies thus obtained can also be modulated using gene manipulation techniques (Borrbaeck and Larrick, (1990) Therapeutic Monoclonal Antibodies).
  • recombinant antibodies can be prepared by cloning a DNA encoding an antibody from antibody-producing cells such as hybridomas and immunized lymphocytes, and inserting it into a suitable vector, and introducing this into host cells.
  • the antibodies of the present invention may be antibody fragments or modified antibodies, as long as they bind to the peptides of the present invention.
  • the antibody fragments can be Fab, F(ab′) 2 , Fv, or a single chain Fv (scFv) in which Fv fragments derived from H and L chains are linked together with a suitable linker (Huston et al., (1998) Proc Natl Acad Sci USA 85: 5879-83).
  • the antibody fragments can be prepared by treating antibodies with an enzyme such as papain and pepsin (Co et al., (1994) J Immunol 152:2968-76; Better and Horwitz, (1989) Methods Enzymol 178: 476-96; Pluckthun and Skerra, (1989) Methods Emzymol 178:497-515; Lamoyi (1986) Methods Enzymol 121:652-63; Rousseaux et al., (1986) Methods Enzymol 121:663-9; Bird and Walker, (1991) Trends Biotech 9:132-7).
  • an enzyme such as papain and pepsin
  • the antibodies of the present invention include modified antibodies obtained by binding antibodies to various molecules such as polyethylene glycol (PEG).
  • PEG polyethylene glycol
  • the antibodies can be modified by conventional chemical modification methods known in the art.
  • the antibodies of the present invention include chimeric antibodies including a variable region derived from a non-human antibody and a constant region derived from a human antibody, and humanized antibodies including a complementarity determining region (CDR) derived from a non-human antibody, a framework region (FR) derived from a human antibody, and a constant region derived from a human antibody.
  • CDR complementarity determining region
  • FR framework region
  • Humanized antibodies are obtained by substituting the CDR sequence region of a human antibody with a rodent CDR region having desired binding activity (Verhoeyen et al., (1988) Science 239:1534-6). Accordingly, compared to chimeric antibodies, humanized antibodies are antibodies in which a smaller region of a human antibody is substituted with a corresponding region of non-human origin.
  • a complete human antibody having a human variable region in addition to human framework and constant regions can also be produced.
  • screening can be carried out using a recombinant library of bacteriophages on which human antibody fragments are displayed (Hoogenboom and Winter, (1992) J Mol Biol 227:381-8).
  • human antibodies can be produced by introducing human immunoglobulin loci into transgenic animals whose endogenous immunoglobulin genes have been partially or completely inactivated (U.S. Pat. Nos. 6,150,584, 5,545,807, 5,545,806, 5,569,825, 5,625,126, 5,633,425, and 5,661,016).
  • the antibodies obtained as stated above can be purified to homogeneity by conventional methods in the art.
  • common methods of protein separation and purification can be used.
  • the antibodies can be separated and purified by a combination of column chromatography such as affinity chromatography, filtration, ultrafiltration, salting out, dialysis, SDS polyacrylamide gel electrophoresis, isoelectric focusing, and such; however, separation and purification methods are not limited thereto (Antibodies: A Laboratory Manual, Ed Harlow and David Lane, (1988) Cold Spring Harbor Laboratory).
  • Protein A columns and protein G columns can be used for affinity columns. Examples of protein A columns include HyperD, POROS, and Sepharose F.F (Pharmacia).
  • chromatography other than affinity chromatography examples include ion exchange chromatography, hydrophobic chromatography, gel filtration, reverse-phase chromatography, adsorption chromatography, and such (Strategies for Protein Purification and Characterization: A Laboratory Course Manual. Ed Daniel R. et al.). Liquid chromatography such as HPLC and FPLC can also be used for chromatography.
  • the antigen-binding affinity of the antibodies of the present invention may be measured using, for example, absorbance measurement, enzyme-linked immunosorbent assay (ELISA), enzyme immunoassay (EIA), radioimmunoassay (RIA), and immunofluorescence assay; however, the methods are not limited thereto.
  • ELISA enzyme-linked immunosorbent assay
  • EIA enzyme immunoassay
  • RIA radioimmunoassay
  • immunofluorescence assay the methods are not limited thereto.
  • the antibodies of the present invention are immobilized onto a plate, and the peptides of the present invention are added, then a sample containing a culture supernatant of antibody-producing cells or purified antibodies is added. Subsequently, a labeled secondary antibody that can recognize and detect the antibody whose antigen-binding affinity is to be measured, is added.
  • reagents for detecting the label of the secondary antibody are added and the absorbance or such is measured.
  • enzymes such as alkaline phosphatase can be used as a label for the secondary antibody
  • enzyme substrates such as p-nitrophenyl phosphate can be used as a reagent for detection.
  • BIAcore Pharmacia
  • the antibodies of the present invention can detect the peptides of the present invention contained in samples. Specifically, the presence of the peptides of the present invention in cancer tissues can be confirmed, for example, by contacting cancer tissue biopsies with the antibodies of the present invention.
  • the antibodies of the present invention recognize FOXM1 peptide fragments whose expression is augmented in various cancer cells, their application is expected to be applicable not only in diagnosis but also for treatment.
  • the present invention also relates to killer T cells and helper T cells induced by in vitro stimulation using the peptides of the present invention, as well as immunocyte populations including the killer T cells and helper T cells.
  • killer T cells and helper T cells induced by in vitro stimulation using the peptides of the present invention, as well as immunocyte populations including the killer T cells and helper T cells.
  • tumor responsive activated T cells are induced when peripheral blood lymphocytes or tumor-infiltrating lymphocytes are stimulated in vitro using the peptides of the present invention, and these activated T cells can be effectively used for adoptive immunotherapy in which the cells are administered to a cancer patient intravascularly, locally to the tumor, or such.
  • dendritic cells which are potent antigen-presenting cells can be pulsed with the peptides of the present invention or genetically transformed to express the peptides, and anti-tumor immune response can be induced by stimulating T cells in vivo or in vitro using the dendritic cells.
  • Killer T cells, helper T cells, or immunocyte populations including them are preferably induced by in vivo or in vitro stimulation using the peptides of the present invention and adjuvants.
  • adjuvants used herein include mineral oil, aluminum hydroxide, Mycobacterium tuberculosis formulations, hemolytic streptococcus formulations, Polyporaceae formulations, other adjuvants, cell growth factors, and cytokines.
  • Tumors can be suppressed and cancers can be prevented and/or treated by transfusion of the thus-obtained helper T cells, killer T cells, or immunocyte populations including them into a cancer patient intravascularly, locally to the tumor, or such.
  • Killer T cells, helper T cells, or immunocyte populations including them that are capable of suppressing tumors as described above can be produced using the peptides of the present invention. Therefore, the present invention provides cell culture media containing the peptides of the present invention. Killer T cells, helper T cells, or immunocyte populations including them capable of suppressing tumors can be prepared using the cell culture media. Furthermore, the present invention provides a cell culture kit including the above-mentioned cell culture medium and a cell culture vessel for production of killer T cells, helper T cells, or immunocyte populations including them.
  • the present invention further provides an endocytic vesicle called “exosome” which presents on its surface a complex formed with a peptide of the present invention and an HLA antigen.
  • Exosomes can be prepared, for example, by the methods described in detail in the Japanese translations of Japanese Patent Application Kohyo Publication No. (JP-A) H11-510507 (unexamined Japanese national phase publication corresponding to a non-Japanese international publication) and JP-A (Kohyo) 2000-512161.
  • JP-A Japanese Patent Application Kohyo Publication No.
  • Exosomes are prepared using antigen-presenting cells obtained from a subject of treatment and/or prevention.
  • Exosomes of the present invention can be injected as a cancer vaccine in a similar manner as the peptides of the present invention.
  • the HLA antigenic type used in the present invention should match the HLA antigenic type of a subject in need of the treatment and/or prevention.
  • the HLA antigenic type is HLA-A2, and preferably, HLA-A2 (HLA-A*0201).
  • HLA-A2 signifies a protein
  • HLA-A*0201 signifies a gene corresponding to a segment of the protein, because of the lack of terminology for expressing segments of the protein at present.
  • the present invention provides methods for inducing antigen-presenting cells using one or more of the peptides of the present invention.
  • Antigen-presenting cells can be induced by contacting dendritic cells induced from peripheral blood monocytes with one or more of the peptides of the present invention to stimulate the dendritic cells.
  • antigen-presenting cells presenting the peptides of the present invention on their surface can be induced in the body of the subject.
  • ex vivo administration may include the steps of:
  • step (2) (2) contacting the antigen-presenting cells of step (1) with a peptide of the present invention (or pulsing the antigen-presenting cells of step (1) with a peptide of the present invention).
  • the antigen-presenting cells obtained in step (2) can be administered into a subject as a vaccine.
  • the present invention also provides methods for inducing antigen-presenting cells that show a killer T cell induction activity.
  • the methods include the step of transfecting antigen-presenting cells in vitro with a gene including a polynucleotide encoding one or more of the peptides of the present invention.
  • the gene to be transfected can be a DNA or RNA.
  • various methods conventionally performed in the art such as lipofection, electroporation, and a calcium phosphate method can be suitably used, but the methods are not limited thereto. More specifically, transfection can be performed as described in Reeves M E, et al., (1996) Cancer Res., 56:5672-7; Butterfield L H, et al., (1998) J.
  • the present invention also provides methods for inducing killer T cells using one or more of the peptides of the present invention.
  • killer T cells By administering one or more of the peptides of the present invention to a subject, killer T cells can be induced in the body of the subject, thus augmenting the immune system that targets cancer cells presenting FOXM1 in tumor tissues.
  • activated killer T cells can be induced by contacting antigen-presenting cells and CD8 positive cells from the subject with one or more of the peptides of the present invention in vitro, and by contacting peripheral-blood mononuclear leukocytes with the antigen-presenting cells in vitro to stimulate the cells.
  • the immune system that targets cancer cells presenting FOXM1 in tumor tissues in a subject can be augmented by returning the activated killer T cells into the body of the subject.
  • the methods include the steps of:
  • step (2) (2) contacting the antigen-presenting cells of step (1) with a peptide of the present invention (or pulsing the antigen-presenting cells of step (1) with a peptide of the present invention);
  • step (3) mixing and co-culturing the antigen-presenting cells of step (2) with CD8 + T cells to induce cytotoxic T cells;
  • step (3) (4) collecting CD8 + T cells from the co-culture of step (3).
  • CD8 + T cells having cytotoxic activity obtained in step (4) can be administered to a subject as a vaccine.
  • the present invention also provides isolated killer T cells induced using one or more of the peptides of the present invention.
  • killer T cells induced by the method of the present invention are derived from a subject who receives the treatment and/or prevention.
  • the cells can be administered in combination with other agents containing antigen-presenting cells or exosomes presenting one or more of the peptides of the present invention.
  • the obtained killer T cells are specific to target cells presenting the same peptide used for induction.
  • the target cells are cells endogenously expressing FOXM1, or cells transfected with the FOXM1 gene.
  • cells presenting the peptide of the present invention on their surface such as cancer cells from pancreatic cancer, cholangiocellular carcinoma, stomach cancer, colon cancer, non-small-cell lung cancer, testicular cancer, cervical cancer, osteosarcoma, and soft tissue sarcoma, can be targets for attack.
  • the present invention also provides antigen-presenting cells presenting a complex formed with an HLA antigen and one or more of the peptides of the present invention.
  • the antigen-presenting cells expressing one or more of the peptides of the present invention or nucleotides encoding such peptides are preferably collected from a subject who receives the treatment and/or prevention.
  • the peptides of the present invention, antigen-presenting cells presenting the peptides, exosomes, or activated killer T cells can be administered as a vaccine in combination with other drugs.
  • Amino acid sequences of human FOXM1 were analyzed using the BIMAS system, and 23 types that are predicted to have binding affinity to HLA-A2 of 20 or more were selected.
  • the HLA-A2 restricted human killer T cell epitopes that were identified in the present invention are underlined.
  • Blood samples 50 ml were collected with informed consent from healthy individuals and HLA-A2 positive breast cancer patients who were undergoing treatment at the Kumamoto University Medical School Hospital. Then, peripheral blood mononuclear cells were isolated using the Ficoll-Conray density gradient centrifugation method according to a previously reported method (Nakatsura, T. et al., Eur. J. Immunol. 32, 826-836, 2002).
  • FOXM1 peptide-specific killer T cells were induced from the isolated peripheral blood mononuclear cells. Killer T cells were induced according to the report by Komori, H. et al. (Komori, H. et al., Clin. Cancer. Res. 12: 2689-2697, 2006).
  • CD8 positive cells in the peripheral blood mononuclear cells were separated using MACS.
  • CD8 negative cells were cultured for four days in the presence of GM-CSF (100 ng/mL) and IL-4 (20 ng/mL) for differentiation into dendritic cells. Thereafter, OK-432 (0.1 KE/mL) was added for maturation of the dendritic cells.
  • each FOXM1 peptide (10 ⁇ M) was added, and then the dendritic cells were co-cultured with the CD8 positive cells in the presence of IL-7 (10 ng/mL). After two days of co-culturing with the CD8 positive cells, IL-2 (20 IU/mL) was added. Antigenic stimulation with the dendritic cells derived from autologous CD8 negative cells was repeated three times at one week interval to induce peptide-specific killer T cells.
  • FIG. 1 shows representative results of the analysis of FOXM1 peptide-induced killer T cells.
  • the cytotoxic activity of the induced FOXM1 peptide-specific killer T cells was examined by a cytotoxicity test, using the HLA-A2 positive and FOXM1-expressing cell line panc-1 and the HLA-A2 negative and FOXM1-expressing pancreatic cancer cell line PK-8 as stimulator cells.
  • the killer T cells were evaluated for cytotoxic activity using a cytotoxicity test by chromium release assay.
  • the chromium release assay was performed using a previously reported method (Monji, M. et al., Clin. Cancer. Res. 10: 6047-6057, 2004).
  • HLA-A2 restricted and FOXM1-specific cytotoxic activity was observed for the killer T cells induced with the FOXM1 362-370, 373-382, and 640-649 peptides ( FIG. 1 ).
  • cancer peptide vaccines that can target approximately 30% of Japanese cancer patients with biliary tract cancer, lung cancer, pancreatic cancer, and such highly expressing FOXM1, were developed by identifying FOXM1 peptides that can bind to HLA-A2 and activate cancer cell-damaging killer T cells. If the effectiveness of the FOXM1 peptides presented to killer T cells by HLA-A2 can be demonstrated in translational medicine, the possibility of clinically applying to Caucasians may be improved. By identifying peptides presented to killer T cells by HLA-A2, which is positive in Caucasians at high frequency, the peptides can be applied not only to approximately 30% of Japanese patients with cancers that highly express FOXM1, but also to many Caucasian cancer patients.

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